Using 777 code in building 787 and making some modifications in cockpit and exterior would shorten building time for dreamliner. 777 and 787 have a lot in common. In cockpit you can allmost use overhead pa panel,electronic checklists,make larger PFD-s,some modifications on radio panel but basicly thay can use code from 777 with little modifications. They have allmost same ceeling and max cruise speed .
Just a thought do,